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1. The Parametric Part window is now open, in which you can define relationships between the parameters you've defined. First, enter a name for the part.
   
   The eventual part will be defined by only three parameters: the hole radius, distance between hole centers, and depth. All other parameters will be functions of these three.
2. The names of the parameters currently listed don't tell the user exactly what they are for, so we can add parameters with more obvious names. To do this, right-click on the first parameter on the list, and select Insert Parameter.
   
3. Name this parameter "HoleRad."
   
4. "HoleRad" is now first parameter on the list. Under "Value," enter the default radius that will be used when you first insert the part.
   
5. Under "Type," specify "Linear."
   
6. Create another parameter for the center-to-center distance between the holes. This parameter can be named "CenToCen." Specify an initial "Value" and "Type."
   
7. Under "Value" next to "H1," replace the number with "HoleRad." Do the same for "H2."
   
8. Define"R" as twice the hole radius.
   
9. Set "W" as equal to "CenToCen."
   
10. Now the three controling parameters needed for the part are defined. They are "HoleRad," "CenToCen," and "D." Click Finish to close the Parametric Part window.

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